Tuesday, August 8, 2017

50 Questions About C Language You Should Know [Part 1]

If you are a coder who're learning C programming language then you should know these questions before you will plan to join an interview for a C related Jobs.

C Programming Languages and Question For An INTERVIEW

1. What does static variable mean? 2. What is a pointer? 3. What is a structure? 4. What are the differences between structures and arrays? 5. In header files whether functions are declared or defined? 6. What are the differences between malloc() and calloc()? 7. What are macros? what are its advantages and disadvantages? 8. Difference between pass by reference and pass by value? 9. What is static identifier? 10. Where are the auto variables stored? 11. Where does global, static, local, register variables, free memory and C Program instructions get stored? 12. Difference between arrays and linked list? 13. What are enumerations? 14. Describe about storage allocation and scope of global, extern, static, local and register variables?15. What are register variables? What are the advantage of using register variables? 16. What is the use of typedef? 17. Can we specify variable field width in a scanf() format string? If possible how? 18. Out of fgets() and gets() which function is safe to use and why? 19. Difference between strdup and strcpy? 20. What is recursion? 21. Differentiate between a for loop and a while loop? What are it uses? 22. What are the different storage classes in C? 23. Write down the equivalent pointer expression for referring the same element a[i][j][k][l]? 24. What is difference between Structure and Unions? 25. What the advantages of using Unions? 26. What are the advantages of using pointers in a program? 27. What is the difference between Strings and Arrays? 28. In a header file whether functions are declared or defined? 29. What is a far pointer? where we use it? 30. How will you declare an array of three function pointers where each function receives two ints and returns a float? 31. what is a NULL Pointer? Whether it is same as an uninitialized pointer? 32. What is a NULL Macro? What is the difference between a NULL Pointer and a NULL Macro? 33. What does the error ‘Null Pointer Assignment’ mean and what causes this error? 34. What is near, far and huge pointers? How many bytes are occupied by them? 35. How would you obtain segment and offset addresses from a far address of a memory location? 36. Are the expressions arr and &arr same for an array of integers? 37. Does mentioning the array name gives the base address in all the contexts? 38. Explain one method to process an entire string as one unit? 39. What is the similarity between a Structure, Union and enumeration? 40. Can a Structure contain a Pointer to itself? 41. How can we check whether the contents of two structure variables are same or not? 42. How are Structure passing and returning implemented by the complier? 43. How can we read/write Structures from/to data files? 44. What is the difference between an enumeration and a set of pre-processor # defines? 45. what do the ‘c’ and ‘v’ in argc and argv stand for? 46. Are the variables argc and argv are local to main? 47. What is the maximum combined length of command line arguments including the space between adjacent arguments? 48. If we want that any wildcard characters in the command line arguments should be appropriately expanded, are we required to make any special provision? If yes, which? 49. Does there exist any way to make the command line arguments available to other functions without passing them as arguments to the function? 50. What are bit fields? What is the use of bit fields in a Structure declaration?